I had this problme once...well I ended up putting the girl in my friend zone as the guy above said. And yh there was interest for quite a long time- like around 2 or 3 months. It ended up with some guy asking her out and at first she didnt say yh, even though I knew she liked him. But I encouraged her, telling her to say yes - but she kept saying "I'll tell him after this after exams or whatever". But in the end I got quite angry and told her to tell him now - and she ended up doing it. She never told me about it, but I kinda found out.
What I am basically trying to say is, yh sure you can keep her in the freind zone as long as you keep the kino escaltion high and make sure there is sexual tension. This should buy you enough time - but dont forget there are othe guys out there as well, so you only have a certain amount of time before you lose her, so make sure you decide before she does.
Good Luck
Angelz.
p.s Freez-out: this is when you bring your game with the girl to a complete stop for a short period amount of time. You stop interacting with her for a while and this makes her anxious because she just lost your attention. This will make her want you more and come after you. And you are freezing out because you are busy with something else (like your social like

) not because you are sulking or angry. Its important you project this impression otherwise the freez-out isn't as effective. ( Lol am sure there are people who disagree with my defintion, am I am open to them corecting me. Thank you)